Needle mechanism for sewing machines



. Nov. 9 1926. I 1,606,327

Y E. TOMMASI NEEDLE mscnamsm FOR sswme mpumss Filed April 12. 1926 assets-Shea; 1

' wlmssggs ATTORNEY rat ERMINIO TOMMAST, OF MILAN, ITALY, ASSIG-NOR' TO THE SINGER MANUFACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION 016 NEW JERSEY.

NEEDLE MECHANISM: FOR SEWING MACHINES.

Application filed April 12,1926. Serial No. 101,359.

This invention relates to sewing machines, more particularly of the type having upper and lower eyed thread-carrying implements which cooperate with one another to form stitches. Machines of this type commonly embody a stop-motion device which automatically arrests the main-shaft in a predetermined angular position with the sewing instrumentalities clear of the work. Lower thread-carrying implements are generally diflicult to thread due to their positions of relative inaccessibility and an object of the present improvement is to provide for easy threading of the under thread-carryingimplement without the necessity of tripping the stop-motion device and turning the main sewing shaft, after which the machine must be run idly through a complete cycle of op- V erations to starting ready to sew.

To the attainment of the ends in view there is provided in the train of mechanism between the main sewing shaft and the under thread-carrying implement, a manually operable disconnecting means whereby such implement may be temporarily disconnected from its driving shaft and projected above the work-support for easy threading. The disconnecting means preferablycomprises a spring-pressed pin-member and a socket-member with independent carriers therefor connected, respectively, to the mainshaft and under thread-carrying implement.

In the accompanying drawings Fig. 1 is a side elevation, partly in section, of a buttonhole sewing machine embodying the invention. Fig. 2 is a front end elevation, partly in section, of the under needle actuating mechanism, and Fig. 3 is a section on the line 33, Fig. 2.

The invention is shown :as embodied in a sewing machine of the buttonhole type having a frame formed with a hollow rectangular bed a from which rises the standard 7) of the overhanging bracket-arm '0 terminatingin the head-cl.

The stitch-forming mechanism may be of any suitable type. it is constructed substantially in accordance with the disclosure ofthe patent to E. B. Allen, No. 1.162,207, of November 30, 1915, and embodies the upper reciprocating straight eye-pointed needle 1 and the lower curved eye-pointed needle 2 which is sustained by the rotary turret 3. The needle position before it is needle-carrier arm 18 which is fulcrumed at In the present machine.-

plates 16 and upper clamping feet 17 and the several remaining elements of themachine not herein specifically set forth are preferably constructed substantially in acto E. B. Allen, No. 1,846,102,0f July 13,

The under needle 2 is mounted on the 19 onthe supporting post 20 rising from the turret 3; The needle-carrier arm 18 is connected by the link 21 to the vertically moving head 22 fixed to the upper "end of the sleeve-shaft 23 slidably mounted within the hollow turret spindle 24:. Slidably mounted in bearings 25, 25, in parallelism with the shaft 23 is a shaft 26 to which is fixed a lateral arm 27 having a forked .extremity 28 embracing the groove 29 in the shaft 23 and thus connecting the shafts23 and 26 to reciprocate in unison. It will-:be understood that reciprocation of suo'h shafts imparts the usual reciprocating movements to the under needle 2, carrying the latter from a position below the needle-throat member or work-support '80 to a position above the same, and return. The needle 2 carries a loop of under thread through the -work'and'presents such loop at the upper side of the work for entry by the upper needle 1 which passes a loop of upper thread through the loop of under thread and A suitablelooper device F 1 is carried by the needle-bar 4 and h 'usual e0 ..cordance with'the disclosure of the patent The arms 33and 34 are coupled together for transmission of operative sewing move ments to the'needle 2 by means of the springpressed coupling pin 44 carried by the lever 33 and entering the socket'37 in the arm 34.

When the machine is at rest the lower needle is normally below the work-support 30 and the parts of its driving mechanism are in full line position, Fig. 2 With the parts in this position the operator may grasp the knob 44 ofthe pin 44 and withdraw the latter from the socket 37 whereupon the lever 33 may be manually shifted to dotted line position, Fig. 2, to project the needle 2 to easy threading position above the worksupport. 'After the needle 2 has beenthreaded, the operator should shift the lever back to initial position wherein the pin 44 registers with the socket 37 and enters the latter when released by the operator.

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, in combination, a work-support, an under thread-carrying implement disposed below the work-support, a main-shaft, operative connections between said shaft and thread-carrying implement, a stop-motion device for stopping said mainshaft with the thread-carrying implement below the work-support, and means for projecting said thread-carrying implement above the work-support without disturbing said stop-motion device. 7

2. In a sewing machine, in combination, a work-support, an under thread-carrying implement disposed below the work-support, a main-shaft, operative connections between said shaft and thread-carrying implement, a stop-motion device for stopping said mainshaft with said thread-carrying implement below the work-support, said connections including coacting pin-and-socket members, independently movable carriers for said members connected, respectively, to the main-shaft and under thread-carrying im-' plement, one of said members being manually withdrawable from working engagement with the other member to permit the under thread-carrying implement to be pro jected above the work-support for easy threading without disturbing said stop-motion device.

3. In a sewing machine, the combination with a work-support and stitch-forming mechanism including an eye-pointed under thread-carrying implement disposed below the work-support, of a driving shaft, operative connections between said driving shaft and said under thread-carrying implement, and a stop-motion device for arresting said shaft with the under thread-carrying implement below the work-support, said oerative connections including a manually cp erable disconnecting means permitting the under thread-carrying implement to be projected above the work-support without disturbing the stop-motion device. 7

4. A sewing machine of the buttonhole type having, in combination, stitch-forming devices including upperand under-needle mechanisms, a rotary turret on which the under-needle mechanism is mounted to partake of its working movements, a needlethroat member, a work-holder, a main sewing shaft, driving connections between said main shaft and said under-needle mechanism, means for relatively moving the stitch-forming devices and work-holder to sew a group of stitches, and a stop-motion device for arresting said shaft at the completion of a sewing period with the needles out of the work, said driving connections including a manually operated element for uncoupling said under-needle mechanism from said main-shaft and projecting the under-needle above the needle-throat member. 5. A sewing machine of the buttonhole type having, in combination, stitch-forming devices includingupper and under needle mechanisms, a rotary turret on which the under needle-mechanism is mounted to partake of its working movements, a needle.

throat member. a work-holder, a'main sewing shaft, driving connections between said main-shaft and said under needle mecha nism, means for relatively moving the stitchforming devices and work-holder to sew a group of stitches, and a stop-motion device for arresting said shaft at the completion of a sewing period with the needles out of the work, said driving connections including coacting pin-and-socket members between said main-shaft and said turret,'one of said mem bers being spring-pressed and manually withdrawable from working engagement with the other member to disconnect said. under needle mechanism from said mainshaft and permit said mechanism to be manually operated to project the under needle above the needle throat member. I

In testimony whereof, I have signed my name to this specification.

ERMINIO TOMMASI. 

